Welding 321 SS tubing to P22 Sch 40 Pipe
Welding 321 SS tubing to P22 Sch 40 Pipe
(OP)
I am looking for some information on WPS requirements for welding 321 Stainless to P22 pipe. The information is below:
Process conditions
Plant life: 30 years
Temperature cycles once every day, constant pressure
Max temp: 750 deg F
Min temp: 180 deg F
Pressure: 230 psi
Materials
Pipe spool: P22 schedule 40 piping with a beveled end, beveled down to .079" thickness
Tubing: 321 SS, 2.5" diameter, square land, .087" thick
Pipe: Carbon Steel schedule 40 piping with a beveled end, beveled down to a .079" thickness
I need procedures to weld:
-Pipe spool to tubing
-Tubing to tubing
-Tubing to Pipe
With this information can anyone tell me what is needed. I would like to do a bi metal PQR if at all possible to keep the costs down.
Any info would help.
Process conditions
Plant life: 30 years
Temperature cycles once every day, constant pressure
Max temp: 750 deg F
Min temp: 180 deg F
Pressure: 230 psi
Materials
Pipe spool: P22 schedule 40 piping with a beveled end, beveled down to .079" thickness
Tubing: 321 SS, 2.5" diameter, square land, .087" thick
Pipe: Carbon Steel schedule 40 piping with a beveled end, beveled down to a .079" thickness
I need procedures to weld:
-Pipe spool to tubing
-Tubing to tubing
-Tubing to Pipe
With this information can anyone tell me what is needed. I would like to do a bi metal PQR if at all possible to keep the costs down.
Any info would help.
T. Dowd
CWI
NDT Level II - MT, PT, UT, RT, VT
ICC Certified
Nuclear Leaad Auditor Trained





RE: Welding 321 SS tubing to P22 Sch 40 Pipe
RE: Welding 321 SS tubing to P22 Sch 40 Pipe
RE: Welding 321 SS tubing to P22 Sch 40 Pipe
The daily temperature cycles would limit the thermal fatigue life using ER309L vs a Nickel base filler.
RE: Welding 321 SS tubing to P22 Sch 40 Pipe
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RE: Welding 321 SS tubing to P22 Sch 40 Pipe
The CWI credential alone does not qualify an individual to develop a WPS. If you are on unfamiliar ground, consult with a professional that is expereinced in developing WPSs and one that is familiar with the materials your are working with.
Your starting point should be a review of the applicable welding standards. In this case I suspect ASME Section IX and either B31.1 or B31.3 would be applicable.
Best regards - Al